I've been using the mini Eleven Free that came with the DAW.
It is very limited in features but has a decent sound.
I had lots of FUN with it but it kind of sounds just like all the other sims I've tried or heard... dead and life less.
I'm realizing that for me, I think sim gear is perfect for playing money making music to drunk people, while it doesn't really offer a lot of sonic satisfaction when I get to use it just for pleasure or recording.
The Eleven rack hardware offers so much more than just a sim... and I just have the limited experience of the limited version of the sim... so I don't know nothing. :-)